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// Copyright 2013-2015 Bowery, Inc.
package prompt
import (
"os"
"syscall"
"unsafe"
)
// Flags to control the terminals mode.
const (
echoInputFlag = 0x0004
insertModeFlag = 0x0020
lineInputFlag = 0x0002
mouseInputFlag = 0x0010
processedInputFlag = 0x0001
windowInputFlag = 0x0008
)
// Error number returned for an invalid handle.
const errnoInvalidHandle = 0x6
var (
kernel = syscall.NewLazyDLL("kernel32.dll")
getConsoleScreenBufferInfo = kernel.NewProc("GetConsoleScreenBufferInfo")
setConsoleMode = kernel.NewProc("SetConsoleMode")
)
// consoleScreenBufferInfo contains various fields for the terminal.
type consoleScreenBufferInfo struct {
size coord
cursorPosition coord
attributes uint16
window smallRect
maximumWindowSize coord
}
// coord contains coords for positioning.
type coord struct {
x int16
y int16
}
// smallRect contains positions for the window edges.
type smallRect struct {
left int16
top int16
right int16
bottom int16
}
// terminalSize retrieves the cols/rows for the terminal connected to out.
func terminalSize(out *os.File) (int, int, error) {
csbi := new(consoleScreenBufferInfo)
ret, _, err := getConsoleScreenBufferInfo.Call(out.Fd(), uintptr(unsafe.Pointer(csbi)))
if ret == 0 {
return 0, 0, err
}
// Results are always off by one.
cols := csbi.window.right - csbi.window.left + 1
rows := csbi.window.bottom - csbi.window.top + 1
return int(cols), int(rows), nil
}
// isNotTerminal checks if an error is related to the input not being a terminal.
func isNotTerminal(err error) bool {
errno, ok := err.(syscall.Errno)
return ok && errno == errnoInvalidHandle
}
// terminal contains the private fields for a Windows terminal.
type terminal struct {
supportsEditing bool
fd uintptr
origMode uint32
}
// newTerminal creates a terminal and sets it to raw input mode.
func newTerminal(in *os.File) (*terminal, error) {
term := &terminal{fd: in.Fd()}
err := syscall.GetConsoleMode(syscall.Handle(term.fd), &term.origMode)
if err != nil {
return term, nil
}
mode := term.origMode
term.supportsEditing = true
// Set new mode flags.
mode &^= (echoInputFlag | insertModeFlag | lineInputFlag | mouseInputFlag |
processedInputFlag | windowInputFlag)
ret, _, err := setConsoleMode.Call(term.fd, uintptr(mode))
if ret == 0 {
return nil, err
}
return term, nil
}
// Close disables the terminals raw input.
func (term *terminal) Close() error {
if term.supportsEditing {
ret, _, err := setConsoleMode.Call(term.fd, uintptr(term.origMode))
if ret == 0 {
return err
}
}
return nil
}
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